使用开源库 SVPullToRefresh 实现上拉加载下拉刷新

//  Copyright (c) 2014年 YouXian. All rights reserved.
//

#import "RootViewController.h"
#import "SVPullToRefresh.h"

@interface RootViewController () <UITableViewDelegate, UITableViewDataSource>

@property (nonatomic, strong) UITableView     *tableView;
@property (nonatomic, strong) NSMutableArray  *dataSource;

@end

@implementation RootViewController

- (void)viewDidLoad
{
    [super viewDidLoad];
    
    //初始化 tableView
    _tableView = [[UITableView alloc] initWithFrame:self.view.bounds
                                              style:UITableViewStyleGrouped];
    _tableView.delegate   = self;
    _tableView.dataSource = self;
    [self.view addSubview:_tableView];
    
    //初始化数据源
    _dataSource = [[NSMutableArray alloc] init];
    for (int i = 0; i < 10; i++)
    {
        [_dataSource addObject:[NSString stringWithFormat:@"%@", [NSDate date].description]];
    }
    
    //注册下拉刷新功能
    __weak RootViewController *weakSelf = self;
    [_tableView addPullToRefreshWithActionHandler:^{
        [weakSelf insertRowAtTop];
    }];
    
    //注册上拉刷新功能
    [_tableView addInfiniteScrollingWithActionHandler:^{
        [weakSelf insertRowAtBottom];
    }];
}

#pragma mark -
#pragma mark PullToRefreshInsertRow

- (void)insertRowAtTop
{
    int64_t delayInSeconds = 2.0;
    dispatch_time_t popTime = dispatch_time(DISPATCH_TIME_NOW, delayInSeconds * NSEC_PER_SEC);
    dispatch_after(popTime, dispatch_get_main_queue(), ^(void){
        //开始更新
        [_tableView beginUpdates];

        //插入数据到数据源(数组的开头)
        [_dataSource insertObject:[NSString stringWithFormat:@"%@", [NSDate date].description]
                                                     atIndex:0];
        
        //在tableView中插入一行(Row开头)
        [_tableView insertRowsAtIndexPaths:@[[NSIndexPath indexPathForRow:0
                                                                inSection:0]]
                          withRowAnimation:UITableViewRowAnimationBottom];
        
        //结束更新
        [_tableView endUpdates];
        
        //停止菊花
        [_tableView.pullToRefreshView stopAnimating];
    });
}

- (void)insertRowAtBottom
{
    int64_t delayInSeconds = 2.0;
    dispatch_time_t popTime = dispatch_time(DISPATCH_TIME_NOW, delayInSeconds * NSEC_PER_SEC);
    dispatch_after(popTime, dispatch_get_main_queue(), ^(void){
        //开始更新
        [_tableView beginUpdates];

        //插入数据到数据源(数组的结尾)
        [_dataSource addObject:[NSString stringWithFormat:@"%@", [NSDate date].description]];
        
        
        //在tableView中插入一行(Row结尾)
        [_tableView insertRowsAtIndexPaths:@[[NSIndexPath indexPathForRow:_dataSource.count - 1
                                                                inSection:0]]
                          withRowAnimation:UITableViewRowAnimationBottom];
        
        //结束更新
        [_tableView endUpdates];
        
        //停止菊花
        [_tableView.infiniteScrollingView stopAnimating];
    });
}

#pragma mark -
#pragma mark UITableViewDataSource

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
    return 1;
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    return _dataSource.count;
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    static NSString *identifier = @"Cell";
    UITableViewCell *cell = [_tableView dequeueReusableCellWithIdentifier:identifier];
    
    if (cell == nil)
    {
        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault
                                      reuseIdentifier:identifier];
    }
    
    cell.textLabel.text = _dataSource[indexPath.row];
    
    return cell;
}

@end